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@article{MAN_1976__222_162851, author = {Mary Schaps}, title = {Birational {Morphisms} {Factorizable} by two {Monoidal} {Transformations.}}, journal = {Mathematische Annalen}, pages = {23--28}, publisher = {mathdoc}, volume = {222}, year = {1976}, zbl = {0309.14009}, url = {http://geodesic.mathdoc.fr/item/MAN_1976__222_162851/} }
Mary Schaps. Birational Morphisms Factorizable by two Monoidal Transformations.. Mathematische Annalen, Tome 222 (1976), pp. 23-28. http://geodesic.mathdoc.fr/item/MAN_1976__222_162851/